epan/dissectors/packet-t38.c

   1 /* Do not modify this file.                                                   */
   2 /* It is created automatically by the ASN.1 to Wireshark dissector compiler   */
   3 /* packet-t38.c                                                               */
   4 /* ../../tools/asn2wrs.py -p t38 -c ./t38.cnf -s ./packet-t38-template -D . T38_2002.asn */
   5
   6 /* Input file: packet-t38-template.c */
   7
   8 #line 1 "packet-t38-template.c"
   9 /* packet-t38.c
  10  * Routines for T.38 packet dissection
  11  * 2003  Hans Viens
  12  * 2004  Alejandro Vaquero, add support Conversations for SDP
  13  * 2006  Alejandro Vaquero, add T30 reassemble and dissection
  14  *
  15  * $Id$
  16  *
  17  * Wireshark - Network traffic analyzer
  18  * By Gerald Combs <gerald@wireshark.org>
  19  * Copyright 1998 Gerald Combs
  20  *
  21  * This program is free software; you can redistribute it and/or
  22  * modify it under the terms of the GNU General Public License
  23  * as published by the Free Software Foundation; either version 2
  24  * of the License, or (at your option) any later version.
  25  *
  26  * This program is distributed in the hope that it will be useful,
  27  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29  * GNU General Public License for more details.
  30  *
  31  * You should have received a copy of the GNU General Public License
  32  * along with this program; if not, write to the Free Software
  33  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  34  */
  35
  36
  37 /* Depending on what ASN.1 specification is used you may have to change
  38  * the preference setting regarding Pre-Corrigendum ASN.1 specification:
  39  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/1998/T38.html  (Pre-Corrigendum=TRUE)
  40  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2003/T38(1998).html (Pre-Corrigendum=TRUE)
  41  *
  42  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2003/T38(2002).html (Pre-Corrigendum=FALSE)
  43  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2002/t38.html  (Pre-Corrigendum=FALSE)
  44  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2002-Amd1/T38.html (Pre-Corrigendum=FALSE)
  45  */
  46
  47 /* TO DO:
  48  * - TCP desegmentation is currently not supported for T.38 IFP directly over TCP.
  49  * - H.245 dissectors should be updated to start conversations for T.38 similar to RTP.
  50  * - Sometimes the last octet is not high-lighted when selecting something in the tree. Bug in PER dissector?
  51  * - Add support for RTP payload audio/t38 (draft-jones-avt-audio-t38-03.txt), i.e. T38 in RTP packets.
  52  */
  53
  54
  55 #ifdef HAVE_CONFIG_H
  56 # include "config.h"
  57 #endif
  58
  59 #include <glib.h>
  60 #include <epan/packet.h>
  61 #include <epan/reassemble.h>
  62 #include <epan/conversation.h>
  63 #include <epan/tap.h>
  64 #include <epan/expert.h>
  65
  66 #include <string.h>
  67
  68 #include "packet-t38.h"
  69 #include <epan/prefs.h>
  70 #include <epan/ipproto.h>
  71 #include <epan/asn1.h>
  72 #include "packet-per.h"
  73 #include "packet-tpkt.h"
  74 #include <epan/emem.h>
  75 #include <epan/strutil.h>
  76
  77 #define PORT_T38 6004
  78 static guint global_t38_tcp_port = PORT_T38;
  79 static guint global_t38_udp_port = PORT_T38;
  80
  81 static int t38_tap = -1;
  82
  83 /* dissect using the Pre Corrigendum T.38 ASN.1 specification (1998) */
  84 static gboolean use_pre_corrigendum_asn1_specification = TRUE;
  85
  86 /* dissect packets that looks like RTP version 2 packets as RTP     */
  87 /* instead of as T.38. This may result in that some T.38 UPTL       */
  88 /* packets with sequence number values higher than 32767 may be     */
  89 /* shown as RTP packets.                                            */
  90 static gboolean dissect_possible_rtpv2_packets_as_rtp = FALSE;
  91
  92
  93 /* Reassembly of T.38 PDUs over TPKT over TCP */
  94 static gboolean t38_tpkt_reassembly = TRUE;
  95
  96 /* Preference setting whether TPKT header is used when sending T.38 over TCP.
  97  * The default setting is Maybe where the dissector will look on the first
  98  * bytes to try to determine whether TPKT header is used or not. This may not
  99  * work so well in some cases. You may want to change the setting to Always or
 100  * Newer.
 101  */
 102 #define T38_TPKT_NEVER 0   /* Assume that there is never a TPKT header    */
 103 #define T38_TPKT_ALWAYS 1  /* Assume that there is always a TPKT header   */
 104 #define T38_TPKT_MAYBE 2   /* Assume TPKT if first octets are 03-00-xx-xx */
 105 static gint t38_tpkt_usage = T38_TPKT_MAYBE;
 106
 107 static const enum_val_t t38_tpkt_options[] = {
 108   {"never", "Never", T38_TPKT_NEVER},
 109   {"always", "Always", T38_TPKT_ALWAYS},
 110   {"maybe", "Maybe", T38_TPKT_MAYBE},
 111   {NULL, NULL, -1}
 112 };
 113
 114
 115
 116 /* T38 */
 117 static dissector_handle_t t38_udp_handle;
 118 static dissector_handle_t t38_tcp_handle;
 119 static dissector_handle_t t38_tcp_pdu_handle;
 120 static dissector_handle_t rtp_handle;
 121 static dissector_handle_t t30_hdlc_handle;
 122 static dissector_handle_t data_handle;
 123
 124 static gint32 Type_of_msg_value;
 125 static guint32 Data_Field_field_type_value;
 126 static guint32 Data_value;
 127 static guint32 T30ind_value;
 128 static guint32 Data_Field_item_num;
 129
 130 static int proto_t38 = -1;
 131
 132 /*--- Included file: packet-t38-hf.c ---*/
 133 #line 1 "packet-t38-hf.c"
 134 static int hf_t38_IFPPacket_PDU = -1;             /* IFPPacket */
 135 static int hf_t38_UDPTLPacket_PDU = -1;           /* UDPTLPacket */
 136 static int hf_t38_type_of_msg = -1;               /* Type_of_msg */
 137 static int hf_t38_data_field = -1;                /* Data_Field */
 138 static int hf_t38_t30_indicator = -1;             /* T30_indicator */
 139 static int hf_t38_t30_data = -1;                  /* T30_data */
 140 static int hf_t38_Data_Field_item = -1;           /* Data_Field_item */
 141 static int hf_t38_field_type = -1;                /* T_field_type */
 142 static int hf_t38_field_data = -1;                /* T_field_data */
 143 static int hf_t38_seq_number = -1;                /* T_seq_number */
 144 static int hf_t38_primary_ifp_packet = -1;        /* T_primary_ifp_packet */
 145 static int hf_t38_error_recovery = -1;            /* T_error_recovery */
 146 static int hf_t38_secondary_ifp_packets = -1;     /* T_secondary_ifp_packets */
 147 static int hf_t38_secondary_ifp_packets_item = -1;  /* OpenType_IFPPacket */
 148 static int hf_t38_fec_info = -1;                  /* T_fec_info */
 149 static int hf_t38_fec_npackets = -1;              /* INTEGER */
 150 static int hf_t38_fec_data = -1;                  /* T_fec_data */
 151 static int hf_t38_fec_data_item = -1;             /* OCTET_STRING */
 152
 153 /*--- End of included file: packet-t38-hf.c ---*/
 154 #line 124 "packet-t38-template.c"
 155
 156 /* T38 setup fields */
 157 static int hf_t38_setup        = -1;
 158 static int hf_t38_setup_frame  = -1;
 159 static int hf_t38_setup_method = -1;
 160
 161 /* T38 Data reassemble fields */
 162 static int hf_t38_fragments = -1;
 163 static int hf_t38_fragment = -1;
 164 static int hf_t38_fragment_overlap = -1;
 165 static int hf_t38_fragment_overlap_conflicts = -1;
 166 static int hf_t38_fragment_multiple_tails = -1;
 167 static int hf_t38_fragment_too_long_fragment = -1;
 168 static int hf_t38_fragment_error = -1;
 169 static int hf_t38_reassembled_in = -1;
 170 static int hf_t38_reassembled_length = -1;
 171
 172 static gint ett_t38 = -1;
 173
 174 /*--- Included file: packet-t38-ett.c ---*/
 175 #line 1 "packet-t38-ett.c"
 176 static gint ett_t38_IFPPacket = -1;
 177 static gint ett_t38_Type_of_msg = -1;
 178 static gint ett_t38_Data_Field = -1;
 179 static gint ett_t38_Data_Field_item = -1;
 180 static gint ett_t38_UDPTLPacket = -1;
 181 static gint ett_t38_T_error_recovery = -1;
 182 static gint ett_t38_T_secondary_ifp_packets = -1;
 183 static gint ett_t38_T_fec_info = -1;
 184 static gint ett_t38_T_fec_data = -1;
 185
 186 /*--- End of included file: packet-t38-ett.c ---*/
 187 #line 143 "packet-t38-template.c"
 188 static gint ett_t38_setup = -1;
 189
 190 static gint ett_data_fragment = -1;
 191 static gint ett_data_fragments = -1;
 192
 193 static gboolean primary_part = TRUE;
 194 static guint32 seq_number = 0;
 195
 196 /* Tables for reassembly of Data fragments. */
 197 static GHashTable *data_fragment_table = NULL;
 198
 199 static const fragment_items data_frag_items = {
 200         /* Fragment subtrees */
 201         &ett_data_fragment,
 202         &ett_data_fragments,
 203         /* Fragment fields */
 204         &hf_t38_fragments,
 205         &hf_t38_fragment,
 206         &hf_t38_fragment_overlap,
 207         &hf_t38_fragment_overlap_conflicts,
 208         &hf_t38_fragment_multiple_tails,
 209         &hf_t38_fragment_too_long_fragment,
 210         &hf_t38_fragment_error,
 211         /* Reassembled in field */
 212         &hf_t38_reassembled_in,
 213         /* Reassembled length field */
 214         &hf_t38_reassembled_length,
 215         /* Tag */
 216         "Data fragments"
 217 };
 218
 219 typedef struct _fragment_key {
 220         address src;
 221         address dst;
 222         guint32 id;
 223 } fragment_key;
 224
 225 static conversation_t *p_conv= NULL;
 226 static t38_conv *p_t38_conv = NULL;
 227 static t38_conv *p_t38_packet_conv = NULL;
 228 static t38_conv_info *p_t38_conv_info = NULL;
 229 static t38_conv_info *p_t38_packet_conv_info = NULL;
 230
 231 /* RTP Version is the first 2 bits of the first octet in the UDP payload*/
 232 #define RTP_VERSION(octet)      ((octet) >> 6)
 233
 234 void proto_reg_handoff_t38(void);
 235
 236 static void show_setup_info(tvbuff_t *tvb, proto_tree *tree, t38_conv *p_t38_conv);
 237 /* Preferences bool to control whether or not setup info should be shown */
 238 static gboolean global_t38_show_setup_info = TRUE;
 239
 240 /* Can tap up to 4 T38 packets within same packet */
 241 /* We only tap the primary part, not the redundancy */
 242 #define MAX_T38_MESSAGES_IN_PACKET 4
 243 static t38_packet_info t38_info_arr[MAX_T38_MESSAGES_IN_PACKET];
 244 static int t38_info_current=0;
 245 static t38_packet_info *t38_info=NULL;
 246
 247 static void t38_defragment_init(void)
 248 {
 249         /* Init reassemble tables */
 250         fragment_table_init(&data_fragment_table);
 251 }
 252
 253
 254 /* Set up an T38 conversation */
 255 void t38_add_address(packet_info *pinfo,
 256                      address *addr, int port,
 257                      int other_port,
 258                      const gchar *setup_method, guint32 setup_frame_number)
 259 {
 260         address null_addr;
 261         conversation_t* p_conversation;
 262         t38_conv* p_conversation_data = NULL;
 263
 264         /*
 265          * If this isn't the first time this packet has been processed,
 266          * we've already done this work, so we don't need to do it
 267          * again.
 268          */
 269         if (pinfo->fd->flags.visited)
 270         {
 271                 return;
 272         }
 273
 274         SET_ADDRESS(&null_addr, AT_NONE, 0, NULL);
 275
 276         /*
 277          * Check if the ip address and port combination is not
 278          * already registered as a conversation.
 279          */
 280         p_conversation = find_conversation( setup_frame_number, addr, &null_addr, PT_UDP, port, other_port,
 281                                 NO_ADDR_B | (!other_port ? NO_PORT_B : 0));
 282
 283         /*
 284          * If not, create a new conversation.
 285          */
 286         if ( !p_conversation || p_conversation->setup_frame != setup_frame_number) {
 287                 p_conversation = conversation_new( setup_frame_number, addr, &null_addr, PT_UDP,
 288                                            (guint32)port, (guint32)other_port,
 289                                                                    NO_ADDR2 | (!other_port ? NO_PORT2 : 0));
 290         }
 291
 292         /* Set dissector */
 293         conversation_set_dissector(p_conversation, t38_udp_handle);
 294
 295         /*
 296          * Check if the conversation has data associated with it.
 297          */
 298         p_conversation_data = conversation_get_proto_data(p_conversation, proto_t38);
 299
 300         /*
 301          * If not, add a new data item.
 302          */
 303         if ( ! p_conversation_data ) {
 304                 /* Create conversation data */
 305                 p_conversation_data = se_alloc(sizeof(t38_conv));
 306
 307                 conversation_add_proto_data(p_conversation, proto_t38, p_conversation_data);
 308         }
 309
 310         /*
 311          * Update the conversation data.
 312          */
 313         g_strlcpy(p_conversation_data->setup_method, setup_method, MAX_T38_SETUP_METHOD_SIZE);
 314         p_conversation_data->setup_frame_number = setup_frame_number;
 315                 p_conversation_data->src_t38_info.reass_ID = 0;
 316                 p_conversation_data->src_t38_info.reass_start_seqnum = -1;
 317                 p_conversation_data->src_t38_info.reass_data_type = 0;
 318                 p_conversation_data->src_t38_info.last_seqnum = -1;
 319                 p_conversation_data->src_t38_info.packet_lost = 0;
 320                 p_conversation_data->src_t38_info.burst_lost = 0;
 321                 p_conversation_data->src_t38_info.time_first_t4_data = 0;
 322
 323
 324                 p_conversation_data->dst_t38_info.reass_ID = 0;
 325                 p_conversation_data->dst_t38_info.reass_start_seqnum = -1;
 326                 p_conversation_data->dst_t38_info.reass_data_type = 0;
 327                 p_conversation_data->dst_t38_info.last_seqnum = -1;
 328                 p_conversation_data->dst_t38_info.packet_lost = 0;
 329                 p_conversation_data->dst_t38_info.burst_lost = 0;
 330                 p_conversation_data->dst_t38_info.time_first_t4_data = 0;
 331 }
 332
 333
 334 fragment_data *
 335 force_reassemble_seq(packet_info *pinfo, guint32 id,
 336              GHashTable *fragment_table)
 337 {
 338         fragment_key key;
 339         fragment_data *fd_head;
 340         fragment_data *fd_i;
 341         fragment_data *last_fd;
 342         guint32 dfpos, size, packet_lost, burst_lost, seq_num;
 343
 344         /* create key to search hash with */
 345         key.src = pinfo->src;
 346         key.dst = pinfo->dst;
 347         key.id  = id;
 348
 349         fd_head = g_hash_table_lookup(fragment_table, &key);
 350
 351         /* have we already seen this frame ?*/
 352         if (pinfo->fd->flags.visited) {
 353                 if (fd_head != NULL && fd_head->flags & FD_DEFRAGMENTED) {
 354                         return fd_head;
 355                 } else {
 356                         return NULL;
 357                 }
 358         }
 359
 360         if (fd_head==NULL){
 361                 /* we must have it to continue */
 362                 return NULL;
 363         }
 364
 365         /* check for packet lost and count the burst of packet lost */
 366         packet_lost = 0;
 367         burst_lost = 0;
 368         seq_num = 0;
 369         for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
 370                 if (seq_num != fd_i->offset) {
 371                         packet_lost += fd_i->offset - seq_num;
 372                         if ( (fd_i->offset - seq_num) > burst_lost ) {
 373                                 burst_lost = fd_i->offset - seq_num;
 374                         }
 375                 }
 376                 seq_num = fd_i->offset + 1;
 377         }
 378
 379         /* we have received an entire packet, defragment it and
 380      * free all fragments
 381      */
 382         size=0;
 383         last_fd=NULL;
 384         for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
 385           if(!last_fd || last_fd->offset!=fd_i->offset){
 386             size+=fd_i->len;
 387           }
 388           last_fd=fd_i;
 389         }
 390         fd_head->data = g_malloc(size);
 391         fd_head->len = size;            /* record size for caller       */
 392
 393         /* add all data fragments */
 394         dfpos = 0;
 395         last_fd=NULL;
 396         for (fd_i=fd_head->next;fd_i && fd_i->len + dfpos <= size;fd_i=fd_i->next) {
 397           if (fd_i->len) {
 398             if(!last_fd || last_fd->offset!=fd_i->offset){
 399               memcpy(fd_head->data+dfpos,fd_i->data,fd_i->len);
 400               dfpos += fd_i->len;
 401             } else {
 402               /* duplicate/retransmission/overlap */
 403               fd_i->flags    |= FD_OVERLAP;
 404               fd_head->flags |= FD_OVERLAP;
 405               if( (last_fd->len!=fd_i->datalen)
 406                   || memcmp(last_fd->data, fd_i->data, last_fd->len) ){
 407                         fd_i->flags    |= FD_OVERLAPCONFLICT;
 408                         fd_head->flags |= FD_OVERLAPCONFLICT;
 409               }
 410             }
 411           }
 412           last_fd=fd_i;
 413         }
 414
 415         /* we have defragmented the pdu, now free all fragments*/
 416         for (fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
 417           if(fd_i->data){
 418             g_free(fd_i->data);
 419             fd_i->data=NULL;
 420           }
 421         }
 422
 423         /* mark this packet as defragmented */
 424         fd_head->flags |= FD_DEFRAGMENTED;
 425         fd_head->reassembled_in=pinfo->fd->num;
 426
 427         if (check_col(pinfo->cinfo, COL_INFO))
 428                         col_append_fstr(pinfo->cinfo, COL_INFO, " (t4-data Reassembled: %d pack lost, %d pack burst lost)", packet_lost, burst_lost);
 429
 430         p_t38_packet_conv_info->packet_lost = packet_lost;
 431         p_t38_packet_conv_info->burst_lost = burst_lost;
 432
 433         return fd_head;
 434 }
 435
 436 /* T38 Routines */
 437
 438 /*--- Included file: packet-t38-fn.c ---*/
 439 #line 1 "packet-t38-fn.c"
 440
 441 const value_string t38_T30_indicator_vals[] = {
 442   {   0, "no-signal" },
 443   {   1, "cng" },
 444   {   2, "ced" },
 445   {   3, "v21-preamble" },
 446   {   4, "v27-2400-training" },
 447   {   5, "v27-4800-training" },
 448   {   6, "v29-7200-training" },
 449   {   7, "v29-9600-training" },
 450   {   8, "v17-7200-short-training" },
 451   {   9, "v17-7200-long-training" },
 452   {  10, "v17-9600-short-training" },
 453   {  11, "v17-9600-long-training" },
 454   {  12, "v17-12000-short-training" },
 455   {  13, "v17-12000-long-training" },
 456   {  14, "v17-14400-short-training" },
 457   {  15, "v17-14400-long-training" },
 458   {  16, "v8-ansam" },
 459   {  17, "v8-signal" },
 460   {  18, "v34-cntl-channel-1200" },
 461   {  19, "v34-pri-channel" },
 462   {  20, "v34-CC-retrain" },
 463   {  21, "v33-12000-training" },
 464   {  22, "v33-14400-training" },
 465   { 0, NULL }
 466 };
 467
 468
 469 static int
 470 dissect_t38_T30_indicator(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 471   offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
 472                                      16, &T30ind_value, TRUE, 7, NULL);
 473
 474 #line 31 "t38.cnf"
 475     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 476         col_append_fstr(actx->pinfo->cinfo, COL_INFO, " t30ind: %s",
 477          val_to_str(T30ind_value,t38_T30_indicator_vals,"<unknown>"));
 478     }
 479
 480     /* info for tap */
 481     if (primary_part)
 482         t38_info->t30ind_value = T30ind_value;
 483
 484   return offset;
 485 }
 486
 487
 488 const value_string t38_T30_data_vals[] = {
 489   {   0, "v21" },
 490   {   1, "v27-2400" },
 491   {   2, "v27-4800" },
 492   {   3, "v29-7200" },
 493   {   4, "v29-9600" },
 494   {   5, "v17-7200" },
 495   {   6, "v17-9600" },
 496   {   7, "v17-12000" },
 497   {   8, "v17-14400" },
 498   {   9, "v8" },
 499   {  10, "v34-pri-rate" },
 500   {  11, "v34-CC-1200" },
 501   {  12, "v34-pri-ch" },
 502   {  13, "v33-12000" },
 503   {  14, "v33-14400" },
 504   { 0, NULL }
 505 };
 506
 507
 508 static int
 509 dissect_t38_T30_data(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 510   offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
 511                                      9, &Data_value, TRUE, 6, NULL);
 512
 513 #line 43 "t38.cnf"
 514     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 515         col_append_fstr(actx->pinfo->cinfo, COL_INFO, " data:%s:",
 516          val_to_str(Data_value,t38_T30_data_vals,"<unknown>"));
 517     }
 518
 519
 520     /* info for tap */
 521     if (primary_part)
 522         t38_info->data_value = Data_value;
 523
 524   return offset;
 525 }
 526
 527
 528 static const value_string t38_Type_of_msg_vals[] = {
 529   {   0, "t30-indicator" },
 530   {   1, "t30-data" },
 531   { 0, NULL }
 532 };
 533
 534 static const per_choice_t Type_of_msg_choice[] = {
 535   {   0, &hf_t38_t30_indicator   , ASN1_NO_EXTENSIONS     , dissect_t38_T30_indicator },
 536   {   1, &hf_t38_t30_data        , ASN1_NO_EXTENSIONS     , dissect_t38_T30_data },
 537   { 0, NULL, 0, NULL }
 538 };
 539
 540 static int
 541 dissect_t38_Type_of_msg(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 542   offset = dissect_per_choice(tvb, offset, actx, tree, hf_index,
 543                                  ett_t38_Type_of_msg, Type_of_msg_choice,
 544                                  &Type_of_msg_value);
 545
 546 #line 24 "t38.cnf"
 547   /* info for tap */
 548   if (primary_part)
 549     t38_info->type_msg = Type_of_msg_value;
 550
 551   return offset;
 552 }
 553
 554
 555 static const value_string t38_T_field_type_vals[] = {
 556   {   0, "hdlc-data" },
 557   {   1, "hdlc-sig-end" },
 558   {   2, "hdlc-fcs-OK" },
 559   {   3, "hdlc-fcs-BAD" },
 560   {   4, "hdlc-fcs-OK-sig-end" },
 561   {   5, "hdlc-fcs-BAD-sig-end" },
 562   {   6, "t4-non-ecm-data" },
 563   {   7, "t4-non-ecm-sig-end" },
 564   {   8, "cm-message" },
 565   {   9, "jm-message" },
 566   {  10, "ci-message" },
 567   {  11, "v34rate" },
 568   { 0, NULL }
 569 };
 570
 571
 572 static int
 573 dissect_t38_T_field_type(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 574   offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
 575                                      8, &Data_Field_field_type_value, (use_pre_corrigendum_asn1_specification)?FALSE:TRUE, (use_pre_corrigendum_asn1_specification)?0:4, NULL);
 576
 577 #line 63 "t38.cnf"
 578     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 579         col_append_fstr(actx->pinfo->cinfo, COL_INFO, " %s",
 580          val_to_str(Data_Field_field_type_value,t38_T_field_type_vals,"<unknown>"));
 581     }
 582
 583     /* We only reassmeble packets in the Primary part and in the first two Items.                       */
 584     /* There maybe be t38 packets with more than two Items, but reassemble those packets is not easy    */
 585     /* using the current ressaemble functions.                                                          */
 586     /* TODO: reassemble all the Items in one frame */
 587     if (primary_part && (Data_Field_item_num<2)) {
 588         if (Data_Field_field_type_value == 2 || Data_Field_field_type_value == 4 || Data_Field_field_type_value == 7) {/* hdlc-fcs-OK or hdlc-fcs-OK-sig-end or t4-non-ecm-sig-end*/
 589             fragment_data *frag_msg = NULL;
 590             tvbuff_t* new_tvb = NULL;
 591             gboolean save_fragmented = actx->pinfo->fragmented;
 592
 593             actx->pinfo->fragmented = TRUE;
 594
 595             /* if reass_start_seqnum=-1 it means we have received the end of the fragmente, without received any fragment data */
 596             if (p_t38_packet_conv_info->reass_start_seqnum != -1) {
 597                 frag_msg = fragment_add_seq(tvb, offset, actx->pinfo,
 598                     p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
 599                     data_fragment_table, /* list of message fragments */
 600                     seq_number + Data_Field_item_num - (guint32)p_t38_packet_conv_info->reass_start_seqnum,  /* fragment sequence number */
 601                     /*0,*/
 602                     0, /* fragment length */
 603                     FALSE); /* More fragments */
 604                 if ( Data_Field_field_type_value == 7 ) {
 605                     /* if there was packet lost or other errors during the defrag then frag_msg is NULL. This could also means
 606                      * there are out of order packets (e.g, got the tail frame t4-non-ecm-sig-end before the last fragment),
 607                      * but we will assume there was packet lost instead, which is more usual. So, we are going to reassemble the packet
 608                      * and get some stat, like packet lost and burst number of packet lost
 609                     */
 610                     if (!frag_msg) {
 611                         force_reassemble_seq(actx->pinfo,
 612                             p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
 613                             data_fragment_table /* list of message fragments */
 614                         );
 615                     } else {
 616                         col_append_str(actx->pinfo->cinfo, COL_INFO, " (t4-data Reassembled: No packet lost)");
 617
 618                         g_snprintf(t38_info->desc_comment, MAX_T38_DESC, "No packet lost");
 619                     }
 620
 621
 622                     if (p_t38_packet_conv_info->packet_lost) {
 623                         g_snprintf(t38_info->desc_comment, MAX_T38_DESC, " Pack lost: %d, Pack burst lost: %d", p_t38_packet_conv_info->packet_lost, p_t38_packet_conv_info->burst_lost);
 624                     } else {
 625                         g_snprintf(t38_info->desc_comment, MAX_T38_DESC, "No packet lost");
 626                     }
 627
 628                     new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
 629                                 "Reassembled T38", frag_msg, &data_frag_items, NULL, tree);
 630
 631                     /* Now reset fragmentation information in pinfo */
 632                     actx->pinfo->fragmented = save_fragmented;
 633
 634                     t38_info->time_first_t4_data = p_t38_packet_conv_info->time_first_t4_data;
 635                     t38_info->frame_num_first_t4_data = p_t38_packet_conv_info->reass_ID; /* The reass_ID is the Frame number of the first t4 fragment */
 636
 637                 } else {
 638                     new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
 639                                 "Reassembled T38", frag_msg, &data_frag_items, NULL, tree);
 640
 641                     /* Now reset fragmentation information in pinfo */
 642                     actx->pinfo->fragmented = save_fragmented;
 643                     actx->pinfo->private_data = t38_info;
 644
 645                     if (new_tvb) call_dissector((t30_hdlc_handle) ? t30_hdlc_handle : data_handle, new_tvb, actx->pinfo, tree);
 646                 }
 647             } else {
 648                 if(tree){
 649                     proto_tree_add_text(tree, tvb, offset, tvb_reported_length_remaining(tvb, offset),
 650                         "[RECEIVED END OF FRAGMENT W/OUT ANY FRAGMENT DATA]");
 651                 }
 652                 col_append_str(actx->pinfo->cinfo, COL_INFO, " [Malformed?]");
 653                 actx->pinfo->fragmented = save_fragmented;
 654             }
 655         }
 656
 657         /* reset the reassemble ID and the start seq number if it is not HDLC data */
 658         if ( p_t38_conv && ( ((Data_Field_field_type_value >0) && (Data_Field_field_type_value <6)) || (Data_Field_field_type_value == 7) ) ){
 659             p_t38_conv_info->reass_ID = 0;
 660             p_t38_conv_info->reass_start_seqnum = -1;
 661         }
 662         t38_info->Data_Field_field_type_value = Data_Field_field_type_value;
 663     }
 664
 665   return offset;
 666 }
 667
 668
 669
 670 static int
 671 dissect_t38_T_field_data(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 672 #line 152 "t38.cnf"
 673     tvbuff_t *value_tvb = NULL;
 674     guint32 value_len;
 675
 676   offset = dissect_per_octet_string(tvb, offset, actx, tree, hf_index,
 677                                        1, 65535, FALSE, &value_tvb);
 678
 679     value_len = tvb_length(value_tvb);
 680
 681
 682
 683 #line 159 "t38.cnf"
 684     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 685         if(value_len < 8){
 686             col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s]",
 687                tvb_bytes_to_str(value_tvb,0,value_len));
 688         }
 689         else {
 690             col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s...]",
 691                tvb_bytes_to_str(value_tvb,0,7));
 692         }
 693     }
 694
 695     /* We only reassmeble packets in the Primary part and in the first two Items.                       */
 696     /* There maybe be t38 packets with more than two Items, but reassemble those packets is not easy    */
 697     /* using the current ressaemble functions.                                                          */
 698     /* TODO: reassemble all the Items in one frame */
 699     if (primary_part && (Data_Field_item_num<2)) {
 700         tvbuff_t* new_tvb = NULL;
 701         fragment_data *frag_msg = NULL;
 702
 703         /* HDLC Data or t4-non-ecm-data */
 704         if (Data_Field_field_type_value == 0 || Data_Field_field_type_value == 6) { /* 0=HDLC Data or 6=t4-non-ecm-data*/
 705             gboolean save_fragmented = actx->pinfo->fragmented;
 706
 707             actx->pinfo->fragmented = TRUE;
 708
 709             /* if we have not reassembled this packet and it is the first fragment, reset the reassemble ID and the start seq number*/
 710             if (p_t38_packet_conv && p_t38_conv && (p_t38_packet_conv_info->reass_ID == 0)) {
 711                 /* we use the first fragment's frame_number as fragment ID because the protocol doesn't provide it */
 712                     p_t38_conv_info->reass_ID = actx->pinfo->fd->num;
 713                     p_t38_conv_info->reass_start_seqnum = seq_number;
 714                     p_t38_conv_info->time_first_t4_data = nstime_to_sec(&actx->pinfo->fd->rel_ts);
 715                     p_t38_packet_conv_info->reass_ID = p_t38_conv_info->reass_ID;
 716                     p_t38_packet_conv_info->reass_start_seqnum = p_t38_conv_info->reass_start_seqnum;
 717                     p_t38_packet_conv_info->time_first_t4_data = p_t38_conv_info->time_first_t4_data;
 718             }
 719
 720             frag_msg = fragment_add_seq(value_tvb, 0, actx->pinfo,
 721                 p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
 722                 data_fragment_table, /* list of message fragments */
 723                 seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum, /* fragment sequence number */
 724                 value_len, /* fragment length */
 725                 TRUE); /* More fragments */
 726
 727             new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
 728                         "Reassembled T38", frag_msg, &data_frag_items, NULL, tree);
 729
 730             if (!frag_msg) { /* Not last packet of reassembled */
 731                 if (Data_Field_field_type_value == 0) {
 732                     if (check_col(actx->pinfo->cinfo, COL_INFO))
 733                         col_append_fstr(actx->pinfo->cinfo, COL_INFO," (HDLC fragment %u)", seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum);
 734                 } else {
 735                     if (check_col(actx->pinfo->cinfo, COL_INFO))
 736                         col_append_fstr(actx->pinfo->cinfo, COL_INFO," (t4-data fragment %u)", seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum);
 737                 }
 738             }
 739
 740             /* Now reset fragmentation information in pinfo */
 741             actx->pinfo->fragmented = save_fragmented;
 742         }
 743     }
 744
 745   return offset;
 746 }
 747
 748
 749 static const per_sequence_t Data_Field_item_sequence[] = {
 750   { &hf_t38_field_type      , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_field_type },
 751   { &hf_t38_field_data      , ASN1_NO_EXTENSIONS     , ASN1_OPTIONAL    , dissect_t38_T_field_data },
 752   { NULL, 0, 0, NULL }
 753 };
 754
 755 static int
 756 dissect_t38_Data_Field_item(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 757   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 758                                    ett_t38_Data_Field_item, Data_Field_item_sequence);
 759
 760 #line 55 "t38.cnf"
 761     if (primary_part) Data_Field_item_num++;
 762
 763   return offset;
 764 }
 765
 766
 767 static const per_sequence_t Data_Field_sequence_of[1] = {
 768   { &hf_t38_Data_Field_item , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_Data_Field_item },
 769 };
 770
 771 static int
 772 dissect_t38_Data_Field(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 773   offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
 774                                       ett_t38_Data_Field, Data_Field_sequence_of);
 775
 776   return offset;
 777 }
 778
 779
 780 static const per_sequence_t IFPPacket_sequence[] = {
 781   { &hf_t38_type_of_msg     , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_Type_of_msg },
 782   { &hf_t38_data_field      , ASN1_NO_EXTENSIONS     , ASN1_OPTIONAL    , dissect_t38_Data_Field },
 783   { NULL, 0, 0, NULL }
 784 };
 785
 786 static int
 787 dissect_t38_IFPPacket(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 788   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 789                                    ett_t38_IFPPacket, IFPPacket_sequence);
 790
 791   return offset;
 792 }
 793
 794
 795
 796 static int
 797 dissect_t38_T_seq_number(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 798   offset = dissect_per_constrained_integer(tvb, offset, actx, tree, hf_index,
 799                                                             0U, 65535U, &seq_number, FALSE);
 800
 801 #line 229 "t38.cnf"
 802     /* info for tap */
 803     if (primary_part)
 804         t38_info->seq_num = seq_number;
 805
 806       if (check_col(actx->pinfo->cinfo, COL_INFO)){
 807         col_append_fstr(actx->pinfo->cinfo, COL_INFO, "Seq=%05u ",seq_number);
 808     }
 809
 810   return offset;
 811 }
 812
 813
 814
 815 static int
 816 dissect_t38_T_primary_ifp_packet(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 817 #line 239 "t38.cnf"
 818     primary_part = TRUE;
 819
 820   offset = dissect_per_open_type(tvb, offset, actx, tree, hf_index, dissect_t38_IFPPacket);
 821
 822 #line 241 "t38.cnf"
 823     /* if is a valid t38 packet, add to tap */
 824     if (p_t38_packet_conv && (!actx->pinfo->in_error_pkt) && ((gint32) seq_number != p_t38_packet_conv_info->last_seqnum))
 825         tap_queue_packet(t38_tap, actx->pinfo, t38_info);
 826
 827     if (p_t38_conv) p_t38_conv_info->last_seqnum = (gint32) seq_number;
 828
 829   return offset;
 830 }
 831
 832
 833
 834 static int
 835 dissect_t38_OpenType_IFPPacket(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 836   offset = dissect_per_open_type(tvb, offset, actx, tree, hf_index, dissect_t38_IFPPacket);
 837
 838   return offset;
 839 }
 840
 841
 842 static const per_sequence_t T_secondary_ifp_packets_sequence_of[1] = {
 843   { &hf_t38_secondary_ifp_packets_item, ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_OpenType_IFPPacket },
 844 };
 845
 846 static int
 847 dissect_t38_T_secondary_ifp_packets(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 848   offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
 849                                       ett_t38_T_secondary_ifp_packets, T_secondary_ifp_packets_sequence_of);
 850
 851   return offset;
 852 }
 853
 854
 855
 856 static int
 857 dissect_t38_INTEGER(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 858   offset = dissect_per_integer(tvb, offset, actx, tree, hf_index, NULL);
 859
 860   return offset;
 861 }
 862
 863
 864
 865 static int
 866 dissect_t38_OCTET_STRING(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 867   offset = dissect_per_octet_string(tvb, offset, actx, tree, hf_index,
 868                                        NO_BOUND, NO_BOUND, FALSE, NULL);
 869
 870   return offset;
 871 }
 872
 873
 874 static const per_sequence_t T_fec_data_sequence_of[1] = {
 875   { &hf_t38_fec_data_item   , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_OCTET_STRING },
 876 };
 877
 878 static int
 879 dissect_t38_T_fec_data(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 880   offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
 881                                       ett_t38_T_fec_data, T_fec_data_sequence_of);
 882
 883   return offset;
 884 }
 885
 886
 887 static const per_sequence_t T_fec_info_sequence[] = {
 888   { &hf_t38_fec_npackets    , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_INTEGER },
 889   { &hf_t38_fec_data        , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_fec_data },
 890   { NULL, 0, 0, NULL }
 891 };
 892
 893 static int
 894 dissect_t38_T_fec_info(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 895   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 896                                    ett_t38_T_fec_info, T_fec_info_sequence);
 897
 898   return offset;
 899 }
 900
 901
 902 static const value_string t38_T_error_recovery_vals[] = {
 903   {   0, "secondary-ifp-packets" },
 904   {   1, "fec-info" },
 905   { 0, NULL }
 906 };
 907
 908 static const per_choice_t T_error_recovery_choice[] = {
 909   {   0, &hf_t38_secondary_ifp_packets, ASN1_NO_EXTENSIONS     , dissect_t38_T_secondary_ifp_packets },
 910   {   1, &hf_t38_fec_info        , ASN1_NO_EXTENSIONS     , dissect_t38_T_fec_info },
 911   { 0, NULL, 0, NULL }
 912 };
 913
 914 static int
 915 dissect_t38_T_error_recovery(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 916 #line 249 "t38.cnf"
 917     primary_part = FALSE;
 918
 919   offset = dissect_per_choice(tvb, offset, actx, tree, hf_index,
 920                                  ett_t38_T_error_recovery, T_error_recovery_choice,
 921                                  NULL);
 922
 923 #line 251 "t38.cnf"
 924     primary_part = TRUE;
 925
 926   return offset;
 927 }
 928
 929
 930 static const per_sequence_t UDPTLPacket_sequence[] = {
 931   { &hf_t38_seq_number      , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_seq_number },
 932   { &hf_t38_primary_ifp_packet, ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_primary_ifp_packet },
 933   { &hf_t38_error_recovery  , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_error_recovery },
 934   { NULL, 0, 0, NULL }
 935 };
 936
 937 static int
 938 dissect_t38_UDPTLPacket(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 939 #line 223 "t38.cnf"
 940     /* Initialize to something else than data type */
 941     Data_Field_field_type_value = 1;
 942
 943   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 944                                    ett_t38_UDPTLPacket, UDPTLPacket_sequence);
 945
 946   return offset;
 947 }
 948
 949 /*--- PDUs ---*/
 950
 951 static int dissect_IFPPacket_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_) {
 952   int offset = 0;
 953   asn1_ctx_t asn1_ctx;
 954   asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
 955   offset = dissect_t38_IFPPacket(tvb, offset, &asn1_ctx, tree, hf_t38_IFPPacket_PDU);
 956   offset += 7; offset >>= 3;
 957   return offset;
 958 }
 959 static int dissect_UDPTLPacket_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_) {
 960   int offset = 0;
 961   asn1_ctx_t asn1_ctx;
 962   asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
 963   offset = dissect_t38_UDPTLPacket(tvb, offset, &asn1_ctx, tree, hf_t38_UDPTLPacket_PDU);
 964   offset += 7; offset >>= 3;
 965   return offset;
 966 }
 967
 968
 969 /*--- End of included file: packet-t38-fn.c ---*/
 970 #line 393 "packet-t38-template.c"
 971
 972 /* initialize the tap t38_info and the conversation */
 973 static void
 974 init_t38_info_conv(packet_info *pinfo)
 975 {
 976         /* tap info */
 977         t38_info_current++;
 978         if (t38_info_current==MAX_T38_MESSAGES_IN_PACKET) {
 979                 t38_info_current=0;
 980         }
 981         t38_info = &t38_info_arr[t38_info_current];
 982
 983         t38_info->seq_num = 0;
 984         t38_info->type_msg = 0;
 985         t38_info->data_value = 0;
 986         t38_info->t30ind_value =0;
 987         t38_info->setup_frame_number = 0;
 988         t38_info->Data_Field_field_type_value = 0;
 989         t38_info->desc[0] = '\0';
 990         t38_info->desc_comment[0] = '\0';
 991         t38_info->time_first_t4_data = 0;
 992         t38_info->frame_num_first_t4_data = 0;
 993
 994
 995         /*
 996                 p_t38_packet_conv hold the conversation info in each of the packets.
 997                 p_t38_conv hold the conversation info used to reassemble the HDLC packets, and also the Setup info (e.g SDP)
 998                 If we already have p_t38_packet_conv in the packet, it means we already reassembled the HDLC packets, so we don't
 999                 need to use p_t38_conv
1000         */
1001         p_t38_packet_conv = NULL;
1002         p_t38_conv = NULL;
1003
1004         /* Use existing packet info if available */
1005          p_t38_packet_conv = p_get_proto_data(pinfo->fd, proto_t38);
1006
1007
1008         /* find the conversation used for Reassemble and Setup Info */
1009         p_conv = find_conversation(pinfo->fd->num, &pinfo->net_dst, &pinfo->net_src,
1010                                    pinfo->ptype,
1011                                    pinfo->destport, pinfo->srcport, NO_ADDR_B | NO_PORT_B);
1012
1013         /* create a conv if it doen't exist */
1014         if (!p_conv) {
1015                 p_conv = conversation_new(pinfo->fd->num, &pinfo->net_src, &pinfo->net_dst,
1016                               pinfo->ptype, pinfo->srcport, pinfo->destport, NO_ADDR_B | NO_PORT_B);
1017
1018                 /* Set dissector */
1019                 conversation_set_dissector(p_conv, t38_udp_handle);
1020         }
1021
1022         if (!p_t38_packet_conv) {
1023                 p_t38_conv = conversation_get_proto_data(p_conv, proto_t38);
1024
1025                 /* create the conversation if it doen't exist */
1026                 if (!p_t38_conv) {
1027                         p_t38_conv = se_alloc(sizeof(t38_conv));
1028                         p_t38_conv->setup_method[0] = '\0';
1029                         p_t38_conv->setup_frame_number = 0;
1030
1031                         p_t38_conv->src_t38_info.reass_ID = 0;
1032                         p_t38_conv->src_t38_info.reass_start_seqnum = -1;
1033                         p_t38_conv->src_t38_info.reass_data_type = 0;
1034                         p_t38_conv->src_t38_info.last_seqnum = -1;
1035                         p_t38_conv->src_t38_info.packet_lost = 0;
1036                         p_t38_conv->src_t38_info.burst_lost = 0;
1037                         p_t38_conv->src_t38_info.time_first_t4_data = 0;
1038
1039                         p_t38_conv->dst_t38_info.reass_ID = 0;
1040                         p_t38_conv->dst_t38_info.reass_start_seqnum = -1;
1041                         p_t38_conv->dst_t38_info.reass_data_type = 0;
1042                         p_t38_conv->dst_t38_info.last_seqnum = -1;
1043                         p_t38_conv->dst_t38_info.packet_lost = 0;
1044                         p_t38_conv->dst_t38_info.burst_lost = 0;
1045                         p_t38_conv->dst_t38_info.time_first_t4_data = 0;
1046
1047                         conversation_add_proto_data(p_conv, proto_t38, p_t38_conv);
1048                 }
1049
1050                 /* copy the t38 conversation info to the packet t38 conversation */
1051                 p_t38_packet_conv = se_alloc(sizeof(t38_conv));
1052                 g_strlcpy(p_t38_packet_conv->setup_method, p_t38_conv->setup_method, MAX_T38_SETUP_METHOD_SIZE);
1053                 p_t38_packet_conv->setup_frame_number = p_t38_conv->setup_frame_number;
1054
1055                 memcpy(&(p_t38_packet_conv->src_t38_info), &(p_t38_conv->src_t38_info), sizeof(t38_conv_info));
1056                 memcpy(&(p_t38_packet_conv->dst_t38_info), &(p_t38_conv->dst_t38_info), sizeof(t38_conv_info));
1057
1058                 p_add_proto_data(pinfo->fd, proto_t38, p_t38_packet_conv);
1059         }
1060
1061         if (ADDRESSES_EQUAL(&p_conv->key_ptr->addr1, &pinfo->net_src)) {
1062                 p_t38_conv_info = &(p_t38_conv->src_t38_info);
1063                 p_t38_packet_conv_info = &(p_t38_packet_conv->src_t38_info);
1064         } else {
1065                 p_t38_conv_info = &(p_t38_conv->dst_t38_info);
1066                 p_t38_packet_conv_info = &(p_t38_packet_conv->dst_t38_info);
1067         }
1068
1069         /* update t38_info */
1070         t38_info->setup_frame_number = p_t38_packet_conv->setup_frame_number;
1071 }
1072
1073 /* Entry point for dissection */
1074 static void
1075 dissect_t38_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1076 {
1077         guint8 octet1;
1078         proto_item *it;
1079         proto_tree *tr;
1080         guint32 offset=0;
1081
1082         /*
1083          * XXX - heuristic to check for misidentified packets.
1084          */
1085         if (dissect_possible_rtpv2_packets_as_rtp){
1086                 octet1 = tvb_get_guint8(tvb, offset);
1087                 if (RTP_VERSION(octet1) == 2){
1088                         call_dissector(rtp_handle,tvb,pinfo,tree);
1089                         return;
1090                 }
1091         }
1092
1093         col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.38");
1094         col_clear(pinfo->cinfo, COL_INFO);
1095
1096         primary_part = TRUE;
1097
1098         /* This indicate the item number in the primary part of the T38 message, it is used for the reassemble of T30 packets */
1099         Data_Field_item_num = 0;
1100
1101         it=proto_tree_add_protocol_format(tree, proto_t38, tvb, 0, -1, "ITU-T Recommendation T.38");
1102         tr=proto_item_add_subtree(it, ett_t38);
1103
1104         /* init tap and conv info */
1105         init_t38_info_conv(pinfo);
1106
1107         /* Show Conversation setup info if exists*/
1108         if (global_t38_show_setup_info) {
1109                 show_setup_info(tvb, tr, p_t38_packet_conv);
1110         }
1111
1112         col_append_str(pinfo->cinfo, COL_INFO, "UDP: UDPTLPacket ");
1113
1114         offset = dissect_UDPTLPacket_PDU(tvb, pinfo, tr);
1115
1116         if (tvb_length_remaining(tvb,offset)>0){
1117                 if (tr){
1118                         proto_tree_add_text(tr, tvb, offset, tvb_reported_length_remaining(tvb, offset),
1119                                 "[MALFORMED PACKET or wrong preference settings]");
1120                 }
1121                 col_append_str(pinfo->cinfo, COL_INFO, " [Malformed?]");
1122         }
1123 }
1124
1125 static void
1126 dissect_t38_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1127 {
1128         proto_item *it;
1129         proto_tree *tr;
1130         guint32 offset=0;
1131     tvbuff_t *next_tvb;
1132         guint16 ifp_packet_number=1;
1133
1134         col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.38");
1135         col_clear(pinfo->cinfo, COL_INFO);
1136
1137         primary_part = TRUE;
1138
1139         /* This indicate the item number in the primary part of the T38 message, it is used for the reassemble of T30 packets */
1140         Data_Field_item_num = 0;
1141
1142         it=proto_tree_add_protocol_format(tree, proto_t38, tvb, 0, -1, "ITU-T Recommendation T.38");
1143         tr=proto_item_add_subtree(it, ett_t38);
1144
1145         /* init tap and conv info */
1146         init_t38_info_conv(pinfo);
1147
1148         /* Show Conversation setup info if exists*/
1149         if (global_t38_show_setup_info) {
1150                 show_setup_info(tvb, tr, p_t38_packet_conv);
1151         }
1152
1153         col_append_str(pinfo->cinfo, COL_INFO, "TCP: IFPPacket");
1154
1155         while(tvb_length_remaining(tvb,offset)>0)
1156         {
1157                 next_tvb = tvb_new_subset_remaining(tvb, offset);
1158                 offset += dissect_IFPPacket_PDU(next_tvb, pinfo, tr);
1159                 ifp_packet_number++;
1160
1161                 if(tvb_length_remaining(tvb,offset)>0){
1162                         if(t38_tpkt_usage == T38_TPKT_ALWAYS){
1163                                 if(tr){
1164                                         proto_tree_add_text(tr, tvb, offset, tvb_reported_length_remaining(tvb, offset),
1165                                                 "[MALFORMED PACKET or wrong preference settings]");
1166                                 }
1167                                 col_append_str(pinfo->cinfo, COL_INFO, " [Malformed?]");
1168                                 break;
1169                         }
1170                         else {
1171                                 if (check_col(pinfo->cinfo, COL_INFO)){
1172                                         col_append_fstr(pinfo->cinfo, COL_INFO, " IFPPacket#%u",ifp_packet_number);
1173                                 }
1174                         }
1175                 }
1176         }
1177
1178 }
1179
1180 static void
1181 dissect_t38_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1182 {
1183         primary_part = TRUE;
1184
1185         if(t38_tpkt_usage == T38_TPKT_ALWAYS){
1186                 dissect_tpkt_encap(tvb,pinfo,tree,t38_tpkt_reassembly,t38_tcp_pdu_handle);
1187         }
1188         else if((t38_tpkt_usage == T38_TPKT_NEVER) || (is_tpkt(tvb,1) == -1)){
1189                 dissect_t38_tcp_pdu(tvb, pinfo, tree);
1190         }
1191         else {
1192                 dissect_tpkt_encap(tvb,pinfo,tree,t38_tpkt_reassembly,t38_tcp_pdu_handle);
1193         }
1194 }
1195
1196 static void
1197 dissect_t38(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1198 {
1199         if(pinfo->ipproto == IP_PROTO_TCP)
1200         {
1201                 dissect_t38_tcp(tvb, pinfo, tree);
1202         }
1203         else if(pinfo->ipproto == IP_PROTO_UDP)
1204         {
1205                 dissect_t38_udp(tvb, pinfo, tree);
1206         }
1207 }
1208
1209 /* Look for conversation info and display any setup info found */
1210 void
1211 show_setup_info(tvbuff_t *tvb, proto_tree *tree, t38_conv *p_t38_conversation)
1212 {
1213         proto_tree *t38_setup_tree;
1214         proto_item *ti;
1215
1216         if (!p_t38_conversation || p_t38_conversation->setup_frame_number == 0) {
1217                 /* there is no Setup info */
1218                 return;
1219         }
1220
1221         ti =  proto_tree_add_string_format(tree, hf_t38_setup, tvb, 0, 0,
1222                       "",
1223                       "Stream setup by %s (frame %u)",
1224                       p_t38_conversation->setup_method,
1225                       p_t38_conversation->setup_frame_number);
1226     PROTO_ITEM_SET_GENERATED(ti);
1227     t38_setup_tree = proto_item_add_subtree(ti, ett_t38_setup);
1228     if (t38_setup_tree)
1229     {
1230                 /* Add details into subtree */
1231                 proto_item* item = proto_tree_add_uint(t38_setup_tree, hf_t38_setup_frame,
1232                                                                tvb, 0, 0, p_t38_conversation->setup_frame_number);
1233                 PROTO_ITEM_SET_GENERATED(item);
1234                 item = proto_tree_add_string(t38_setup_tree, hf_t38_setup_method,
1235                                                      tvb, 0, 0, p_t38_conversation->setup_method);
1236                 PROTO_ITEM_SET_GENERATED(item);
1237     }
1238 }
1239
1240
1241
1242 /* Wireshark Protocol Registration */
1243 void
1244 proto_register_t38(void)
1245 {
1246         static hf_register_info hf[] =
1247         {
1248
1249 /*--- Included file: packet-t38-hfarr.c ---*/
1250 #line 1 "packet-t38-hfarr.c"
1251     { &hf_t38_IFPPacket_PDU,
1252       { "IFPPacket", "t38.IFPPacket",
1253         FT_NONE, BASE_NONE, NULL, 0,
1254         NULL, HFILL }},
1255     { &hf_t38_UDPTLPacket_PDU,
1256       { "UDPTLPacket", "t38.UDPTLPacket",
1257         FT_NONE, BASE_NONE, NULL, 0,
1258         NULL, HFILL }},
1259     { &hf_t38_type_of_msg,
1260       { "type-of-msg", "t38.type_of_msg",
1261         FT_UINT32, BASE_DEC, VALS(t38_Type_of_msg_vals), 0,
1262         NULL, HFILL }},
1263     { &hf_t38_data_field,
1264       { "data-field", "t38.data_field",
1265         FT_UINT32, BASE_DEC, NULL, 0,
1266         NULL, HFILL }},
1267     { &hf_t38_t30_indicator,
1268       { "t30-indicator", "t38.t30_indicator",
1269         FT_UINT32, BASE_DEC, VALS(t38_T30_indicator_vals), 0,
1270         NULL, HFILL }},
1271     { &hf_t38_t30_data,
1272       { "t30-data", "t38.t30_data",
1273         FT_UINT32, BASE_DEC, VALS(t38_T30_data_vals), 0,
1274         NULL, HFILL }},
1275     { &hf_t38_Data_Field_item,
1276       { "Data-Field item", "t38.Data_Field_item",
1277         FT_NONE, BASE_NONE, NULL, 0,
1278         NULL, HFILL }},
1279     { &hf_t38_field_type,
1280       { "field-type", "t38.field_type",
1281         FT_UINT32, BASE_DEC, VALS(t38_T_field_type_vals), 0,
1282         NULL, HFILL }},
1283     { &hf_t38_field_data,
1284       { "field-data", "t38.field_data",
1285         FT_BYTES, BASE_NONE, NULL, 0,
1286         NULL, HFILL }},
1287     { &hf_t38_seq_number,
1288       { "seq-number", "t38.seq_number",
1289         FT_UINT32, BASE_DEC, NULL, 0,
1290         NULL, HFILL }},
1291     { &hf_t38_primary_ifp_packet,
1292       { "primary-ifp-packet", "t38.primary_ifp_packet",
1293         FT_NONE, BASE_NONE, NULL, 0,
1294         NULL, HFILL }},
1295     { &hf_t38_error_recovery,
1296       { "error-recovery", "t38.error_recovery",
1297         FT_UINT32, BASE_DEC, VALS(t38_T_error_recovery_vals), 0,
1298         NULL, HFILL }},
1299     { &hf_t38_secondary_ifp_packets,
1300       { "secondary-ifp-packets", "t38.secondary_ifp_packets",
1301         FT_UINT32, BASE_DEC, NULL, 0,
1302         NULL, HFILL }},
1303     { &hf_t38_secondary_ifp_packets_item,
1304       { "secondary-ifp-packets item", "t38.secondary_ifp_packets_item",
1305         FT_NONE, BASE_NONE, NULL, 0,
1306         "OpenType_IFPPacket", HFILL }},
1307     { &hf_t38_fec_info,
1308       { "fec-info", "t38.fec_info",
1309         FT_NONE, BASE_NONE, NULL, 0,
1310         NULL, HFILL }},
1311     { &hf_t38_fec_npackets,
1312       { "fec-npackets", "t38.fec_npackets",
1313         FT_INT32, BASE_DEC, NULL, 0,
1314         "INTEGER", HFILL }},
1315     { &hf_t38_fec_data,
1316       { "fec-data", "t38.fec_data",
1317         FT_UINT32, BASE_DEC, NULL, 0,
1318         NULL, HFILL }},
1319     { &hf_t38_fec_data_item,
1320       { "fec-data item", "t38.fec_data_item",
1321         FT_BYTES, BASE_NONE, NULL, 0,
1322         "OCTET_STRING", HFILL }},
1323
1324 /*--- End of included file: packet-t38-hfarr.c ---*/
1325 #line 671 "packet-t38-template.c"
1326                 {   &hf_t38_setup,
1327                     { "Stream setup", "t38.setup", FT_STRING, BASE_NONE,
1328                     NULL, 0x0, "Stream setup, method and frame number", HFILL }},
1329                 {   &hf_t38_setup_frame,
1330             { "Stream frame", "t38.setup-frame", FT_FRAMENUM, BASE_NONE,
1331             NULL, 0x0, "Frame that set up this stream", HFILL }},
1332         {   &hf_t38_setup_method,
1333             { "Stream Method", "t38.setup-method", FT_STRING, BASE_NONE,
1334             NULL, 0x0, "Method used to set up this stream", HFILL }},
1335                 {&hf_t38_fragments,
1336                         {"Message fragments", "t38.fragments",
1337                         FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1338                 {&hf_t38_fragment,
1339                         {"Message fragment", "t38.fragment",
1340                         FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1341                 {&hf_t38_fragment_overlap,
1342                         {"Message fragment overlap", "t38.fragment.overlap",
1343                         FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL } },
1344                 {&hf_t38_fragment_overlap_conflicts,
1345                         {"Message fragment overlapping with conflicting data",
1346                         "t38.fragment.overlap.conflicts",
1347                         FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL } },
1348                 {&hf_t38_fragment_multiple_tails,
1349                         {"Message has multiple tail fragments",
1350                         "t38.fragment.multiple_tails",
1351                         FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL } },
1352                 {&hf_t38_fragment_too_long_fragment,
1353                         {"Message fragment too long", "t38.fragment.too_long_fragment",
1354                         FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL } },
1355                 {&hf_t38_fragment_error,
1356                         {"Message defragmentation error", "t38.fragment.error",
1357                         FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1358                 {&hf_t38_reassembled_in,
1359                         {"Reassembled in", "t38.reassembled.in",
1360                         FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1361                 {&hf_t38_reassembled_length,
1362                         {"Reassembled T38 length", "t38.reassembled.length",
1363                         FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } },
1364         };
1365
1366         static gint *ett[] =
1367         {
1368                 &ett_t38,
1369
1370 /*--- Included file: packet-t38-ettarr.c ---*/
1371 #line 1 "packet-t38-ettarr.c"
1372     &ett_t38_IFPPacket,
1373     &ett_t38_Type_of_msg,
1374     &ett_t38_Data_Field,
1375     &ett_t38_Data_Field_item,
1376     &ett_t38_UDPTLPacket,
1377     &ett_t38_T_error_recovery,
1378     &ett_t38_T_secondary_ifp_packets,
1379     &ett_t38_T_fec_info,
1380     &ett_t38_T_fec_data,
1381
1382 /*--- End of included file: packet-t38-ettarr.c ---*/
1383 #line 715 "packet-t38-template.c"
1384                 &ett_t38_setup,
1385                 &ett_data_fragment,
1386                 &ett_data_fragments
1387         };
1388
1389         module_t *t38_module;
1390
1391         proto_t38 = proto_register_protocol("T.38", "T.38", "t38");
1392         proto_register_field_array(proto_t38, hf, array_length(hf));
1393         proto_register_subtree_array(ett, array_length(ett));
1394         register_dissector("t38", dissect_t38, proto_t38);
1395
1396         /* Init reassemble tables for HDLC */
1397         register_init_routine(t38_defragment_init);
1398
1399         t38_tap = register_tap("t38");
1400
1401         t38_module = prefs_register_protocol(proto_t38, proto_reg_handoff_t38);
1402         prefs_register_bool_preference(t38_module, "use_pre_corrigendum_asn1_specification",
1403             "Use the Pre-Corrigendum ASN.1 specification",
1404             "Whether the T.38 dissector should decode using the Pre-Corrigendum T.38 "
1405                 "ASN.1 specification (1998).",
1406             &use_pre_corrigendum_asn1_specification);
1407         prefs_register_bool_preference(t38_module, "dissect_possible_rtpv2_packets_as_rtp",
1408             "Dissect possible RTP version 2 packets with RTP dissector",
1409             "Whether a UDP packet that looks like RTP version 2 packet will "
1410                 "be dissected as RTP packet or T.38 packet. If enabled there is a risk that T.38 UDPTL "
1411                 "packets with sequence number higher than 32767 may be dissected as RTP.",
1412             &dissect_possible_rtpv2_packets_as_rtp);
1413         prefs_register_uint_preference(t38_module, "tcp.port",
1414                 "T.38 TCP Port",
1415                 "Set the TCP port for T.38 messages",
1416                 10, &global_t38_tcp_port);
1417         prefs_register_uint_preference(t38_module, "udp.port",
1418                 "T.38 UDP Port",
1419                 "Set the UDP port for T.38 messages",
1420                 10, &global_t38_udp_port);
1421         prefs_register_bool_preference(t38_module, "reassembly",
1422                 "Reassemble T.38 PDUs over TPKT over TCP",
1423                 "Whether the dissector should reassemble T.38 PDUs spanning multiple TCP segments "
1424                 "when TPKT is used over TCP. "
1425                 "To use this option, you must also enable \"Allow subdissectors to reassemble "
1426                 "TCP streams\" in the TCP protocol settings.",
1427                 &t38_tpkt_reassembly);
1428         prefs_register_enum_preference(t38_module, "tpkt_usage",
1429                 "TPKT used over TCP",
1430                 "Whether T.38 is used with TPKT for TCP",
1431                 (gint *)&t38_tpkt_usage,t38_tpkt_options,FALSE);
1432
1433         prefs_register_bool_preference(t38_module, "show_setup_info",
1434                 "Show stream setup information",
1435                 "Where available, show which protocol and frame caused "
1436                 "this T.38 stream to be created",
1437                 &global_t38_show_setup_info);
1438
1439 }
1440
1441 void
1442 proto_reg_handoff_t38(void)
1443 {
1444         static gboolean t38_prefs_initialized = FALSE;
1445         static guint tcp_port;
1446         static guint udp_port;
1447
1448         if (!t38_prefs_initialized) {
1449                 t38_udp_handle=create_dissector_handle(dissect_t38_udp, proto_t38);
1450                 t38_tcp_handle=create_dissector_handle(dissect_t38_tcp, proto_t38);
1451                 t38_tcp_pdu_handle=create_dissector_handle(dissect_t38_tcp_pdu, proto_t38);
1452                 rtp_handle = find_dissector("rtp");
1453                 t30_hdlc_handle = find_dissector("t30.hdlc");
1454                 data_handle = find_dissector("data");
1455                 t38_prefs_initialized = TRUE;
1456         }
1457         else {
1458                 dissector_delete_uint("tcp.port", tcp_port, t38_tcp_handle);
1459                 dissector_delete_uint("udp.port", udp_port, t38_udp_handle);
1460         }
1461         tcp_port = global_t38_tcp_port;
1462         udp_port = global_t38_udp_port;
1463
1464         dissector_add_uint("tcp.port", tcp_port, t38_tcp_handle);
1465         dissector_add_uint("udp.port", udp_port, t38_udp_handle);
1466
1467 }
1468